2 Kubota rtv 900

Used Kubota rtvs one runs and drives, both 3 cylinder Kubota diesel and cvt transmission, other is full parts with 80% everything there not sure what is wrong with engine and transmission, could fix or use parts for running one, running one could use tlc, seat is bad, both are 2x4 previous owner took shaft out, has glass window and grill gaurd both have caps on cab, good tires on running one